Permanent magnet type erasing head

Abstract

A permanent magnet type demagnetizing head is made by successively molding a resin-magnet which forms a body having a magnetic member forming a part of a tape contact surface and a resin which forms protection member forming a remainder part of the tape contact surface, and therefore a manufacturing process is simplified, and further quality of the demagnetizing head is improved, since size precision is enhanced.

What is claimed is: 
     
       1. A permanent magnetic type erasing head comprising: a body formed from a resin-magnet material said body including means for mounting to audio equipment and also including a unitary magnet member having an end face defining a first tape contact surface and at least one side face defined in a plane substantially perpendicular to a plane of said first tape contact surface said magnet member having a protrusion extending from said side face in a direction substantially perpendicular to said plane of said at least one side face, said protrusion including a relatively large portion and a relatively small portion, said relatively small portion being spaced from said plane of said first tape contact surface a distance greater than said relatively large portion; and   a protection member formed around said magnetic member with said protrusion, said protection member having an end face defining a second tape contact surface coplaner with and surrounding said first tape contact surface, said protection member being made of a nonmagnetic resin material, said protection member interlock with said protrusion so as to fix said protection member with respect to said magnet member.   
     
     
       2. A permanent magnet type erasing head in accordance with claim 1, wherein: said protrusion has a trapezoidal shape, having two parallel sides, one of said parallel sides being longer than the other of said parallel sides, said longer parallel side being disposed nearer said first tape contact surface than the shorter side.